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Characterization and phase‐transition behavior of thermoresponsive PVME nanogels in the presence of cellulose nanowhiskers: Rheology, morphology, and FTIR studies
Author(s) -
Hadaeghnia Milad,
Goharpey Fatemeh,
Khademzadeh Yeganeh Jafar
Publication year - 2019
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25035
Subject(s) - materials science , rheology , fourier transform infrared spectroscopy , phase (matter) , chemical engineering , viscoelasticity , nucleation , polymer , nanoparticle , relaxation (psychology) , polymer chemistry , composite material , nanotechnology , organic chemistry , psychology , social psychology , chemistry , engineering
The effects of cellulose nanowhiskers (CNWs) and irradiation dose on phase separation behavior as well as rheological and physical properties of Poly vinyl methyl ether (PVME) nanogels are investigated. Interactions between CNWs and polymer chains lead to the dehydration of PVME chains. Increasing the irradiation dose or CNW weight fraction enhances the VPTT, due to the decreased chain mobility. The phase separation behaviors of hybrid and nonhybrid nanogels are investigated at two different quench depths. At the shallow quench depth, the samples phase separate through nucleation and growth (NG) mechanism. However in the case of hybrid nanogels with a higher temperature, as a result of the enhanced dynamic asymmetry induced by the increased quench depth and the interaction of PVME chains with CNWs, the phase separation mechanism changes from NG to viscoelastic phase separation (VPS). The linear rheological behavior of nanogels was well correlated with the evolution of corresponding phase‐separating morphologies. At 40°C, a shoulder appeared in the storage modulus curve in the intermediate frequency range, due to shape relaxation of the droplets formed by NG mechanism. However, a solid‐like behavior was observed due to the existence of a percolated network structure induced by VPS at 60°C. POLYM. ENG. SCI., 59:899–912, 2019. © 2018 Society of Plastics Engineers